CN203504814U - LED fluorescent lamp driving circuit having overtemperature and overvoltage protection function - Google Patents
LED fluorescent lamp driving circuit having overtemperature and overvoltage protection function Download PDFInfo
- Publication number
- CN203504814U CN203504814U CN201320544205.7U CN201320544205U CN203504814U CN 203504814 U CN203504814 U CN 203504814U CN 201320544205 U CN201320544205 U CN 201320544205U CN 203504814 U CN203504814 U CN 203504814U
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- led
- constant current
- control chip
- current control
- circuit
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses an LED fluorescent lamp driving circuit having an overtemperature and overvoltage protection function. The driving circuit comprises a surge protection circuit, a rectification circuit, a filter circuit, an LED lamp string and a protection circuit which are sequentially and electrically connected. The protection circuit is provided with an LED constant current control chip, one end of the LED constant current control chip is connected with the LED lamp string, the other end of the LED constant current control chip is connected with a voltage limiting protection circuit, a temperature measuring protection circuit is disposed in the LED constant current control chip, and the voltage limiting protection circuit comprises a protection resistor serially connected at the output current setting end of the LED constant current control chip. According to the utility model, the LED lamp string in an LED fluorescent lamp is driven and controlled via the LED constant current control chip and the protection resistor, the LED lamp string is ensured to shine with a constant current, the voltage across the two ends is not ultrahigh, and an overheating protection function is achieved, so that the LED fluorescent lamp can be reliably controlled and protected.
Description
Technical field
The utility model relates to LED field of illumination lamp technology, relates in particular to a kind of LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function.
Background technology
LED fluorescent lamp is that a kind of shell is with reference to existing fluorescent tube design; adopt ultra-bright LED white light as the lighting of illuminating source; the fluorescent tube inside of LED fluorescent lamp is provided with circuit board; circuit board is provided with a plurality of LED lamp pearls and drive circuit; drive circuit is the core component of LED fluorescent lamp; it controls the luminescent properties of LED lamp pearl, and LED lamp pearl is protected, and prevents that LED lamp bead is damaged by too high voltage or overtemperature.
Summary of the invention
For overcoming the deficiencies in the prior art, the utility model provides a kind of simple and reliable for structure, LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function that protective value is good.
The utility model is to reach the technical scheme that above-mentioned technical purpose adopts to be: a kind of LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function; it comprises surge protection circuit, rectification circuit, filter circuit, LED lamp string and the protective circuit being electrically connected successively; in described protective circuit, be provided with LED constant current control chip; described LED constant current control chip one end is connected with LED lamp string, and the described LED constant current control chip other end connects pressure limited protection circuit.
In described LED constant current control chip, be provided with thermometric protective circuit.
The model of described LED constant current control chip is SM2082.
Described pressure limited protection circuit comprises and is connected on the protective resistance that LED constant current control chip output current arranges end.
The resistance of described protective resistance is 20 ohm.
The beneficial effects of the utility model are: adopt said structure; by being set, a LED constant current control chip and protective resistance drive the LED lamp string of controlling in LED fluorescent lamp; guarantee that LED lamp string is that constant current is luminous; both end voltage can superelevation; and there is overheat protective function simultaneously, can carry out reliable control and protection to LED fluorescent lamp.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail.Wherein:
Fig. 1 is the principle schematic that the utlity model has the LED fluorescent lamp drive circuit of over-temp and over-pressure defencive function.
Embodiment
By describing technology contents of the present utility model, structural feature in detail, being realized object and effect, below in conjunction with execution mode and coordinate accompanying drawing to be explained in detail.
Refer to shown in Fig. 1; the LED fluorescent lamp drive circuit that the utlity model has over-temp and over-pressure defencive function comprises surge protection circuit 1, rectification circuit 2, filter circuit 3, LED lamp string 4 and the protective circuit 5 being electrically connected successively; in described protective circuit, 5 are provided with LED constant current control chip 51; described LED constant current control chip 51 one end are connected with LED lamp string 4, and described LED constant current control chip 51 other ends connect pressure limited protection circuit 52.
In described LED constant current control chip 51, be provided with thermometric protective circuit.
The model of described LED constant current control chip 51 is SM2082.
Described pressure limited protection circuit 52 comprises and is connected on the protective resistance that LED constant current control chip 51 output currents arrange end.
The resistance of described protective resistance 52 is 20 ohm.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. a LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function; it is characterized in that: it comprises surge protection circuit, rectification circuit, filter circuit, LED lamp string and the protective circuit being electrically connected successively; in described protective circuit, be provided with LED constant current control chip; described LED constant current control chip one end is connected with LED lamp string, and the described LED constant current control chip other end connects pressure limited protection circuit.
2. a kind of LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function according to claim 1, is characterized in that: in described LED constant current control chip, be provided with thermometric protective circuit.
3. a kind of LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function according to claim 1 and 2, is characterized in that: the model of described LED constant current control chip is SM2082.
4. a kind of LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function according to claim 1, is characterized in that: described pressure limited protection circuit comprises and is connected on the protective resistance that LED constant current control chip output current arranges end.
5. a kind of LED fluorescent lamp drive circuit with over-temp and over-pressure defencive function according to claim 4, is characterized in that: the resistance of described protective resistance is 20 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320544205.7U CN203504814U (en) | 2013-09-03 | 2013-09-03 | LED fluorescent lamp driving circuit having overtemperature and overvoltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320544205.7U CN203504814U (en) | 2013-09-03 | 2013-09-03 | LED fluorescent lamp driving circuit having overtemperature and overvoltage protection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203504814U true CN203504814U (en) | 2014-03-26 |
Family
ID=50335751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320544205.7U Expired - Lifetime CN203504814U (en) | 2013-09-03 | 2013-09-03 | LED fluorescent lamp driving circuit having overtemperature and overvoltage protection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203504814U (en) |
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2013
- 2013-09-03 CN CN201320544205.7U patent/CN203504814U/en not_active Expired - Lifetime
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